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346 results on '"Liu, Enfeng"'

44. Mongolian Dust Activity Over the Last 25 Kyr Predominantly Driven by the East Asian Winter Monsoon: Insights From the Geochemistry of Lake Tuofengling Sediments.

Author

Zhang, Wenfang, Zhang, Enlou, Liu, Enfeng, Abell, Jordan T., Sun, Weiwei, Ni, Zhenyu, Chen, Rong, Cai, Yue, and Meng, Xianqiang

Subjects
LAKE sediments, GEOCHEMISTRY, MERIDIONAL overturning circulation, LAST Glacial Maximum, DUST, OCEAN circulation, DUST storms
Abstract

Dust deposition in northeastern Asia since the Last Glacial Maximum has previously been studied using a variety of archives. However, the mechanisms driving variability in dust are less well constrained. Here, we present records of the Nd‐Sr isotope and major element composition of sediments from Lake Tuofengling, a crater lake located in northeastern China, over the past ∼25 thousand years. The results indicate that the lithogenic fractions of the sediments are a mixture between aeolian dust and local volcanic detritus. Our provenance data suggest that the aeolian dust component is predominantly from the Mongolia Plateau, likely carried by the East Asian Winter Monsoon. Our isotope and calculated dust flux records exhibit similar changing patterns to proxies of global ice volume and the strength of Atlantic meridional overturning circulation, potentially implicating ice sheets and ocean circulation as the dominant drivers of the East Asian Winter Monsoon over this time interval. Plain Language Summary: Dust storms occur frequently throughout Central and East Asia today. Several driving factors, particularly related to the East Asian Summer Monsoon, the East Asian Winter Monsoon (EAWM), and the westerlies, can influence dust production and transport in these regions, both in the modern and during the past. Uncovering the dominant factor(s) can assist in furthering our understanding of atmospheric circulation over Asia during climates both similar and different from today. Here, we collected sediments from a crater lake (Lake Tuofengling (TFL)) located in northeastern Asia and reconstructed dust inputs over the past 25 thousand years. We found that the dust delivered to TFL sediments is mainly sourced from the Mongolian Plateau associated with transport via winds related to the EAWM. Further in‐depth analysis indicates that shifts in ice volume and Atlantic Ocean circulation may be important drivers for the EAWM, at least over the past 25 thousand years. Key Points: Geochemical evidence suggests that the Mongolian Plateau (MP) is the main source of dust for Lake Tuofengling (TFL)The East Asian Winter Monsoon (EAWM) is likely the dominant carrier of aeolian dust from the MP to TFLDust flux and EAWM variability could be driven by a combination of changes in ice volume and Atlantic Ocean circulation [ABSTRACT FROM AUTHOR]

Published
2023
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49. Spatial variation of organic carbon sequestration in large lakes and implications for carbon stock quantification

Author

Lin, Qi, Liu, Enfeng, Zhang, Enlou, Bindler, Richard, Nath, Bibhash, Zhang, Ke, Shen, Ji, Lin, Qi, Liu, Enfeng, Zhang, Enlou, Bindler, Richard, Nath, Bibhash, Zhang, Ke, and Shen, Ji

Abstract

Lakes are recognized as critical zones for carbon transformation and storage, and lacustrine sediments sequestrate considerable amounts of organic carbon (OC). Understanding sedimentation processes and OC burial patterns is crucial to clarifying lakes’ role in global carbon cycling. However, OC sedimentation may be quite spatially heterogeneous within an aquatic system, owing to the differences in OC production and sources, hydrodynamic conditions and underwater topography. The uncertainties in estimating OC sequestration in the world’s large lakes remain poorly constrained. This study takes the test case of two large lakes (50 and 249 km2) with different water depth and trophic status, using a multi-core paleolimnological technique, to identify the spatial variation in OC accumulation and its main influencing factors over the past century. Results of multi-core comparisons revealed similar temporal trends in major organic and nutrient parameters, suggesting coherent processes of whole-lake sedimentary environment changes for each lake. The OC preserved in sediments was primarily of autochthonous origin. However, OC standing stocks varied ∼3-fold spatially, and average OC accumulation rates ranged between 9.5–27.4 g m−2 yr−1 (post–1963 in oligo-mesotrophic deep-lake Lugu) and between 17.4–43.5 g m−2 yr−1 (post–1980 in eutrophic shallow-lake Erhai), respectively. These variations were primarily attributable to the spatial differences in aquatic primary production and terrestrial detritus supply relating to anthropogenic land-use change and phosphorus loading, rather than intra-lake sediment focusing-related transport and redistribution. The single central-core approach from Lugu Lake would overestimate whole-lake OC stock by 32% or underestimate the value by 48%, indicating spatial variability is an important source of uncertainty for OC stock quantification in similar large and/or morphometrically complex waterbodies. Therefore, spatial heterogeneity of OC accumulat

Published
2022
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